According to scientists, tree-ring analysis shows that California drought is the worst it has been in 500 years.The study underscores the severity of current drought and the challenges of future water management in the state.

The seesaw between El Niño and La Niña is set to get stronger with global warming. Signs are that this year and next will deliver a big swing from one to the other, prompting fires and floods across the world.

In a hotter, drier West, who, besides fish, will be most harmed?
James Marvin Phelps/flickrJune 29, 2015